python-mylib/mylib/report.py

""" Report """

import atexit
import logging

from mylib.config import ConfigurableObject, StringOption
from mylib.email import EmailClient

log = logging.getLogger(__name__)


class Report(ConfigurableObject):  # pylint: disable=useless-object-inheritance
    """Logging report"""

    _config_name = "report"
    _config_comment = "Email report"
    _defaults = {
        "recipient": None,
        "subject": "Report",
        "loglevel": "WARNING",
        "logformat": "%(asctime)s - %(levelname)s - %(message)s",
        "just_try": False,
    }

    content = []
    handler = None
    formatter = None
    email_client = None

    def __init__(self, email_client=None, initialize=True, **kwargs):
        super().__init__(**kwargs)
        self.email_client = email_client
        self._attachment_files = []
        self._attachment_payloads = []

        if initialize:
            self.initialize()

    def configure(self, **kwargs):  # pylint: disable=arguments-differ
        """Configure options on registered mylib.Config object"""
        section = super().configure(
            just_try_help=kwargs.pop("just_try_help", "Just-try mode: do not really send report"),
            loaded_callback=self.initialize,
            **kwargs,
        )

        section.add_option(StringOption, "recipient", comment="Report recipient email address")
        section.add_option(
            StringOption,
            "subject",
            default=self._defaults["subject"],
            comment="Report email subject",
        )
        section.add_option(
            StringOption,
            "loglevel",
            default=self._defaults["loglevel"],
            comment='Report log level (as accept by python logging, for instance "INFO")',
        )
        section.add_option(
            StringOption,
            "logformat",
            default=self._defaults["logformat"],
            comment='Report log level (as accept by python logging, for instance "INFO")',
        )

        if not self.email_client:
            self.email_client = EmailClient(config=self._config)
            self.email_client.configure()

        return section

    def initialize(self, loaded_config=None):
        """Configuration initialized hook"""
        super().initialize(loaded_config=loaded_config)
        self.handler = logging.StreamHandler(self)

        loglevel = self._get_option("loglevel").upper()
        assert hasattr(logging, loglevel), f"Invalid report loglevel {loglevel}"
        self.handler.setLevel(getattr(logging, loglevel))

        self.formatter = logging.Formatter(self._get_option("logformat"))
        self.handler.setFormatter(self.formatter)

    def get_handler(self):
        """Retreive logging handler"""
        return self.handler

    def write(self, msg):
        """Write a message"""
        self.content.append(msg)

    def get_content(self):
        """Read the report content"""
        return "".join(self.content)

    def add_attachment_file(self, filepath):
        """Add attachment file"""
        self._attachment_files.append(filepath)

    def add_attachment_payload(self, payload):
        """Add attachment payload"""
        self._attachment_payloads.append(payload)

    def send(self, subject=None, rcpt_to=None, email_client=None, just_try=None):
        """Send report using an EmailClient"""
        if rcpt_to is None:
            rcpt_to = self._get_option("recipient")
        if not rcpt_to:
            log.debug("No report recipient, do not send report")
            return True
        if subject is None:
            subject = self._get_option("subject")
        assert subject, "You must provide report subject using Report.__init__ or Report.send"
        if email_client is None:
            email_client = self.email_client
        assert email_client, (
            "You must provide an email client __init__(), send() or send_at_exit() methods argument"
            " email_client"
        )
        content = self.get_content()
        if not content:
            log.debug("Report is empty, do not send it")
            return True
        msg = email_client.forge_message(
            rcpt_to,
            subject=subject,
            text_body=content,
            attachment_files=self._attachment_files,
            attachment_payloads=self._attachment_payloads,
        )
        if email_client.send(
            rcpt_to, msg=msg, just_try=just_try if just_try is not None else self._just_try
        ):
            log.debug("Report sent to %s", rcpt_to)
            return True
        log.error("Fail to send report to %s", rcpt_to)
        return False

    def send_at_exit(self, **kwargs):
        """Send report at exit"""
        atexit.register(self.send, **kwargs)